We, also, have a small orchard that needs attended to this time of year. We have apples, cherries, peaches, plums, necterines, and a pear. The following is what we do to them to assure a good crop..........as long as the weather cooperates and the blooms don't freeze.
This spraying schedule works for all fruit trees with a pit with the exception of apricots. Spraying apricots can stunt their fruits.
We try to grow our produce organically at home so the copper or lime follow these organic principles. Once in awhile we have to bring in the big guns and treat something that is not responding to organics but for the most part we will dig out the offender and destroy it.
I hope that this gives you a little information on keeping fruit trees. If you need any help at all just let us know and we would be happy to walk you through it.